Adding-machine.



F. WHEAT. ADDING MAGHINE.

-.APPLIOATION FILED MAY 24, 1910 n 1,053,687. Patented Feb.18,1913

` P. WHEAT.

ADDING MACHINE. APPLICATIQN FILED 111AY24, 1910.

Patented Feb. 18, 1913.

e sHBpTs-sHEET2- E. WHEAT.

ADDING MACHINE.

APPLICATION FILED MAY 24,1910.

Patented Feb. 18, 1913.

F. WHEAT.

ADDING MACHINE.

APPLIoATloN FILED MAY 24, 1910.

.Patented Feb. 18, 1913.

6 SHEETS-SHEET 4.

LP. WHEAT ADDNG MACHINE.

APPLIOMION ULEB MAY 24, mxo.

Lil)

Patented Feb. 18, 1913.

` 5 SHEETS-SHEET G.

'UNiTED srr-rrns NT FFIOE.

FREDERICK WHEAT, OIF LONDON, ENGLAND, ASSIGNOR TO BURROUGHS ADDING MACHINE COMPANY, F DETROIT, MICHIGAN, A CORPORATION MICHIGAN.

ADDING-MACHINE.

Specification offetters P'atent.

Patented' ren-18,1913.

mitigation ined Mey 24, 1910. serial No. 563,085.

To all whom it may concern.' y

Be 1t known that. I, .Fnnnnmou il HEAT, u

i subjectief ythe, King of England, residing at 65 High. Holbornf,.,London, England, have 4invented certain new and uset'ul Improve f @tulp en adding machine for nccumuiating ut erwiseA than according to the decimal tem,1es for exemple uoording to English undazrd or legal uvoirdupois table of `eight, in which twentyfeight pounds make y 'one yquarter, tour quarters make 10G-weight .o trjlll 'pounds, und twenty such hundred v^`ii'eilrglits Ineke one ton of 2240 pounds, comionly called uy long ton as distinguished .from `thetou of 2,000 pounds or short ton,

which is the standard in America.'

"-'lt Will be obvious that in order to take cere of amounts registered or accumulated eccordin to such table considerable modification o .transfer or carrying mechanism is required es compared. with that suitable for n purely decimal system,

Thus, in e'. nio.- chine` employing the usuel dined series ot adding wheels, with every registration of 28, upon units and tens wheels there should be a carry to a wheel for registering quarters, While at the seme time the units wheel must be capable of registering 8 ort) pounds softh'at its movement one step beyond the 7 position should not result in :i zero registreton. Furthermore, in the case otregistering by 10s alone, when the number of pounds exceeds that constituting one quarter, es for example pvounds, there should be u curry which will register on the units wheel the extra pounds. Then u double curry muy be necessary' on, the tens wheel, as t'or example 'with the addition of 0 pounds on the units wheel when it and the tens wheel wus ulmentioned ,provision is made by the present invention for carrying; backw'urd und torwurd between the tens ond units wheels and for a double carry from the units to the tens Wheel.

,. The invention is vhere shown applied to -`=the,welhknowu .Burroughs adding; machine, inf-.which carrying is done by return movementof racks beyond normal. Carrying; mechanism of the usual character serves for ln such caso carrying from one wheel to another across the series, as from the units wheel to the tens when thelatter is not ut the same time or has not already registered tens o1 pounds and from the tens'wheel to the quarters wheel, the quarters wheel to the units of cwt. Wheel, from the latte-r to the tens of cwt. Wheel, from the latter to the units of tons Wheel, and so on, though for accumulating according to the ubovementioned trible ot' Weight, as the invention is here shown embodied, the tens Wheel has twelve teeth and in one complete revolution will trip the transfer mechanism of the quarters wheel four times, und the quarters wheel'also has twelve teeth and is equi pcd to trip the transfer mechanism of tie units of ewt.

wheel threetimes in one complete rotation, und the tens of cWt. Wheel is equipped to trip the transfer mechanism of the units oi" tons wheel five times in one complete rotation.

In the drawings which accompany und form part of this specification, Figure 1 ropresents in right'side elevation u` Burroughs machine embodying" the present invention: Fig. 2 represents n considerable portion of the'sanie in Afront elevation; Figs. 3, 4 und 5 are sections taken on the line 3 3 of Fig. 2 illustrntingz,r different relations of parts under different conditions; Fig. G is n section taken. on thev line (3--6 of Fig. und corresponding with Fig. 1t :is to the periodl oi operation; Fig. 7 is o section taken on the line 7-7 of Fig. 3; Fig. H is :i section taken on the'sume linev us Fig. t3 but illustrating` o different condition; Fig. 9 is u'section token on the line 0-9 of Fig. i2 illustrating what ensues in on operation :is :i result o't precedent conditions such us illust ruled in Fig.

8: Fig". l() is u view somewhat silnilnr to Fig'. y

i) but illustrating` ports :it nornml: Figs. 1l und l2 ure sci-tional views illustrutintr some ot' the parts which uppeur in Fig. l() though ditlerently related; Figs. 13 und li ure scotions token on the line 12in-lf3 und lJf--14 of Fig'. 2; Fig. 15 is n sectional und dingrummutio `view, the section being taken ou the suine line ns Figs. (3, 8 und i); Fig'. 1G is u perspective view ot' u portion ot the tiecumulnting mechanism viewed from above; Fig. 17 isn view similar to Fig. 7 but illustruting u different condition: Fig. 18 is u plan View of' the keyboard of the much-ine; Fig. 19 is e section on the line '19-19 of Fig. 18; Fig. Z0 is u section on the line0-20 of Fig. 19; Fig. 21 (Sheet 2) is a vertical section taken substantially on the line 21g-21 of Fig. Q; Figs. 22 to show examples of recording, and Fig. 2G (Sheet 1) is a horizontal section taken substantially `on line 26-26 of Fig. 1.

The accumulating wheels have the same location as iii the ordinary and well-known Burroughs adding and listing machine and they engage with and disengage from a set of actuating racks in the usual manner and as fully. explained in William S. Burroughs'` Patent, No. 504,963, issued September 12, 1893. Furthermore the arrangement for measuring descent. of the racks by depression of amount lteys is of the same character as that described in said patent and the prie mary transfer mechanism is also of the character disclosed in said patent. has, there are levers (311 loosely journaled upon a central rock shaftJ (500 which carries the usual restoringframe or bail G17, and segmental racks 610 have slot and pin engagement with said levers, and springs GSO tend to impel the racks upwardly beyond their noi-malpesitions, being restrained by pawls e113 which engage over studs 651 on the racks. Displacement of the pawls through rotation of associated. wheels permits return movement of racks beyond normal for 'carrying puroses.

The first, wheel at the right, designated 916, is hf similar character to the ordinary accumulating wheel of the Burroughs inachine in that its pinion has teu teeth and its periphery is inieribed from zero to 9. Correspondingly, there are nine keys (Fig. 18) in the iirst column or row of amount keys 291. Then, as in the ordinary machine, this units wheel 916 ,is adapted to cause a carry of 1 to the tens wheel 316b in moving from 9 to zerp by reason of its cani disk 912a wiping past the foot c f the transfer pawl L113b which normally restrains the raclt engaging the pinion of the tens wheel 916". Thus the wheel 916a is capable of registering units of pounds up to 9 and then carrying to the tens wheel. inasmuch as the latter is not to register beyond two tens of pounds or 20, its periphery, instead of being inscribed from zero to 9 inscribed simply from zero to Q, this character of inscription being repeated four times and the cam disk 912b ofthis wheel being correspondingly constructed withA four equi-distant acting portions to wipe past and displace the pawl 413 which normally restrains the rack of the quarters wheel 916C. Correspcndingly, there are but two amount keys 291b in the second or s row inscribed respectively 1 and 2. Inasinuch as the registration of four quarters en-` tails a carry of 1 to the units of cwti. wheel` only three keys 291 are needed in the third row, inscribed respectirely 1, 2 and and` correspondingly, the quarters wheel 916c is inscribed from zero to 23, this beingr repeated three times on the periphery of this wheel and its pinion haring` tweli'c teeth and its cani 912, Fig. 13, having three cqurdistant acting portions to displace the pawl lt-13(1 which normally restrains the rack o1' the units of cwt. wheel. The latter, 9161, has a ten-tooth pinion and is inscribed from zero to 9 and its cam 912d trips the associated transfer pawl Z113c once in a rotation as in the ordiurry construction to cause a carry to the ten, t cwt. wheel 916e. Inasmuch as registration of cwt, entails a transfer or carry of 1 to the units of tons Wheel, said wheel 916e is merely inscribed with alternating 1s and zeros and as its pinion has ten teeth its cani 912e has tive equi-distant :ictingportions as illustrated in Fig. 14- for acting upon the transfer pawl 413i of the units of tons wheel 91Gf. The latter and the higher order tons wheels are of the ordinary type inscribed from zero to 9 and the transfor mechanism associated with them is the usual one. As the tens of cwt. wheel 916 would never be turned but a single step as measured by depression, of a key, a single ltey would'suflice, but for conrenience nine keys are employed, as shown in Fig. 1S, cach however having only the function of withdrawing the rack-retaininggf latches 4-15. A. single tixed stop 270n limits the descent of the rock.

In addition to transferring or carrying such as abo-ve mentioned, it becomes necessary to provide for carrying operations upon the unitsl wheel 916a derived from the tens wheel when 10s only are being registered or both units and 10s, and also for effecting a double carry in asingle operation upon the tens wheel. To this end special devices are provided which will now be described.

rlfhe first thing to be noted is that the rack of the units wheel has a slot o, Fig. 3, double the length of the usual `slot as will be seen by comparison with Figs, 13 and 14, which slot pro-vides for transfer movement of the units rack. sutlieieut to turn the units wheel 'two steps im ad of one. The necessity for this is explained by the fact that whenever ,this wheel turns lo the point of registering eight` pounds in conjunction with registration of 2O by the tens wheel 916h said units wheel should turn to zero and in order to do so it must be advanced two steps. Furthermore, in the event of placed by'a .finger A which is secured to a rock 'shaft B journaled in the accumulator frame, said finger of course being normally swung forward asillustrated by dotted lines C associated with the units Wheel 916a andA u the other branch of said cross-liead extends witli the wheel.

in rear of, an arm D associated with. the tens wheel 916", said arms being independently journaled between the dividing plates of the accumulator.' frameand normally resting against the tie strip 910i of said frame as illustrated in Figs. 5 and'S. The upper end of the arm C is widened and has a curved edge c normally eccentric to the Wheel 916n and lying in the path of 1novement of a laterally projecting stud c2 on the cam disk 912, the relationship being such that as the said wheel moves from a position registering 7 to a position registering 8 this stlii .vill act uponsaid edge and rock the arin C to the position shown in Figs. 3 and 4, s -id edge being then brought concentric Normally the. said arm C is spaced from the swivel cross-liead B2 as Shown in Fig. 17 and also in Fig. 16, but

'such movement of the arm brings it into contact with said cross-head Whosepther branch is normally in engagement with the Aarm Das illustrated in Fig. 17. New this movement of the arm C obviously effects no.

movement of the rock shaft B or finger A, though it does establish a relationship between the;- cross-head`l3i2 and said arm C which will result in movement of the said -be a rockingof the arni B, shaft B and rock shaft and finger in the event that the .tens wheel 916b moves far enough to register 2.l The other arm D is under control of finger A, and a consequent displacement of the pawl 418, with the effect of turning the units Wheel two steps `forward. .It will be understood that' in'such case the arm C is held against forward movement by reason Vof is engagement with the in c2. Rearward swinging of the `arm D is effected by the engagement therewith of one or another of four equi-distant studs d, projecting laterally from the cam disk 912", Fig. (i, and therelationship'of parts is such-(see diagrain Fig, 15) thatl movement of the wheel 916" from zerov to 1 simply moves the on.- coming stud up to the arm without actuating l,the latter', whereas movement of the wheel from 1 to 2'swings the arm rearward far enough to bring about the action abovev described.

It will be seen fi'oin the above that should the 2 key in the 10`s row and the 8 key in the units row be depressed and the handle of the machine pulled to register 'Q8 pounds, the result would be that the units Wheel, after having registered 8 pounds, would be turned on two steps farther so as to clear it or show its zero. This entails a carry to the tens wheel because the cam 912 in passing from 9 to Zero will of course act upon the footof the regular transfer pawl 4131 which normallyI rest-rains the rack of the tens Wheel. In Aconsequencethe tens wheel will also be cleared-or' advanced from the 2 to zero position. In every suoli movement of the tens wheel it in turn carries to the quarters Wheel by reason of one point of its Cain disk 912b wiping past the foot. of the .pavvl 413c which normally restrains the rack -machine (Fig. 22) and 2 is then registered on the tens wheel in a succeeding operation.

And a similar result would ensue' if the reverse order of registration were followed, z'. e. if 2 should be registered upon the tens .wheel in one operation and@ upon the units wheel in the succeeding operation though in such case the arm D would first niove rearward, carrying the cross-head B into engagement with the arInC, and then the latter in moving rearward would rock the sha't'tB, the arm D affording the fulcruni in this instance instead of the arm C as before described.

If instead of the registration of a quarter .being effected as above described, it should `be by successive depression of a key or keys of the tens row, then a dubie trasnsfer would be equally necessary to theunitili wheel because there would be an excess of pounds over the quarter, i'or example in depress'v ing the 1 fkeyv of the tens row `three times in succession or the 1 key and then the 2 key. As this of course would not involve i movement of the units wheel to the S position and its consequent positioning ot the aini C to afford a fulcruni for the crosshead B2, initial means are provided for ther, as in a third operation of the machin with the 1 key depressed', which `woul LJ rariv the wheel t'roin 2 to zero, eauseszsaid lat'eiallvY turned portion d otl the arnil) to act 'upon the arm ll and rock the saine and the finger so as to e; use the double yearri* to the units wheel thereby registering; two pounds upon the latter. The total would he l. quarter 2 pounds, as shown on the. example in Vig'. 2l. where the printing,` of the successive los ot pounds is shown and the printing o'lthe, total. ln Fig. 22v an example is `riren of a record ol operations so1ncwhat similar to those referred to in eonneo tion with the registration of 2S upon the' units and tens wheels. though represented in this example as resulting troni registration of S upon the units wheel in one operation and 2 upon the tens wheel in a succeeding operation with a total of one quarter; lt. is obvious` however. that the turning oir the unitsI and tenswheels to Zero would conte about in the saine inanner as above explained where it was i'neserihed that the 2 key in the tens row and the S key in the units row were both depressed and the handle pulled. I

Still another' condition is to he. considered in connection with the turning ot` the units and tens wheels to zero hy reason ot registration of 2S pounds and that is such as the example in Fig. Q3 represents. 1'9 pounds having' heen registeretl upon the units and tens wheels and then 9 pounds upon the, nuits wheel; will of courseI mean an accumulat-ien oi' QS pounds and should entail a transfer to the quarter wheel and a clearing ot the units and tens wheels. This requires t'urther special devices. for the elearing ot the tens wheel lneans a two step advauee and it receives no advance by reason ot' depression of a key in its own hanlt. For the purpose of providing for a two step advance ot the teus wheel in such ease its raelt is 'formed with a slot` e. oil double the usual length or ot approximately the saine length as the elongated slot o in the units racl -but as this tens rack only partakes of a two step riseheyond normal under conditions such as above inentioned` it vis neces sary to provide speeiai nieans for limiting its rise to one step when only a lsingle Carry is called for to the tens wheel. The rack stud '651 is normally restrained hy the pawl 413. Fig. lt) iu the ordinalv way and when in the example mentioned the units wheel passes from E) to zero its cam 912 trips the pawl 413" so that .the rack may rise.' However, a .special pawl l@ then stands in the. path o'l the stud 651 to limit the rise of the rack to a singley step as illustrated in Fig. S. Said special pawl is pivoted ooneentrieally with thel pawl 41:5 and connected hy a spring e with the, forward arui of the latter. This palwl lil is normally held against a forward edge ot the pawl 418" hy said spring as illustrated in Fig. l() and presents its lower end edge to the stud `@5l when the pawl il??? is disi'ilaeed. At a pointI above this end edge there is a shoulder e? spaced troni said end edge the saine, distance that the latter is spaced from the under edge of the pawl 413", or in other words spaced halt` the distance of the slot en rIhe rotation of the units wheel nine steps to the 8 position and the consequent tripping of its own transter pawl. in such manner as hereinloe t'ore described` causing it again to pass from i) to zero. will result in a displacement ot` the auxiliary pawl E and the. removal'ot" the lower end edge ot the latter freni en- `ragenient with the stud 651 so as to permit the full. rise of the 4rack as illustrated in Fig. 9. This is effected through the me diuin ot' an arin -l13f=r pivotcd to the, trainework at f, Fig. t). and having a t'oot at its hottoni past which the rain Si?" wipes. )t pertion olf .said arln extending :there its pivot jointed to the pawl .l by a pin or stud e in the latter and ashort slot. in the arm, the latter extending farther upwardsin front. (if the erosssrod on 'which theii'iawls are p ivoted. When the pawl elli, is Sjwtnig; rearward its iorward 'extension is swung down and through the medium of the sl'zring e rocks the auxiliary pawl l so-as o bring the bottoni end edge ot the latter over the stud 651 (iFig. S). This rocking of said pawl E causes rocking of the arm 413g through the lnediinn of the aforesaid stud or pine arid the slot it engages. Thus thet'ooty f of said arin L1113s is broughtv into the line of travel ot' the acting portion oi" the cani 912 as illustrated in Fig. 1l, lhen said eain'wipes past` the toot 'the arxn llj is rocked back and through the medium of the slot and pin e" swings the auxiliary pawl E.

forward against the stress of the spring e so as to take the hottorn end edge of said pawl outy ot line` with the stud G51 and bring the shoulder o2 into ,lino with said stud as illustrated in -Fig. 9.

In the succeeding operation of the 1nachine when the rack is restered to normal of course the stud 651 will he carried'down past the lower end ot the auxiliary paa'l E whereupon the spring e' will roel: the latter haelt to aiposition shown in Fig. 8 and eorrespondingly'rock the arin 413e hut the toot 'of the. latter will he again withdrawn troni the line of travel ot the 'acting portionot the cam 912 by reason of the stud (35i passing` on down below .the pawl itil and the latter being' unlatehed in the. ordinary way and restored to normal hv its own spring ,4t-13, the foot of thel pawl ttt-5 heine,r then brought into line with the acting;` portion of the cam SH2 as shown in Fig, 12, where the foot j" of the arln 413g is shown withdrawn frein the path of travel of said cam (see also Fig. l0).

Fig. 25 shows an example of work in vresulting in carries to the quarters wheel so `that the pounds Wheels will be left at zero,

ih@ successive 'registration of three quarters 1n connection with the 28 pounds registra- ,tions causing carries to the units of cwt.

n r4wheel and the latter'carrying to the tens of lcwt. wheel and this,wheel carrying tothe units of tons wheel'and the latter to fthe 4tens of tons Wheel and the tens of l,ton wheel to the hundreds of tons wheel, softhat the total is 400 pounds.

The explanation ofabsence of cipher-s in the totals shown by examples in Figs. 22,

- 24, ;'is1 that the hammer latches 717, Fig. 21, have the familiar split characteristie. 4flhus, the1 overlapping tails of the units of tens latch, the units of cwt. latch and the quarters latch are omitted. The

overlapping tails of other latches are desig nated by the letter t. A lnasmuch as the racks `:for the units ot' pounds and the tens of poundsA wheels have slots `of double length, as hereinbefore exjplained, it is obvious that the corresponding levers 611 may partake of more movement relative. to" the racks than others of the levers Glland Vthis must of course be taken into consideration -in connection with the positioning of type 618 on the rear ends l of the levers 611.A By reference to Fig; 1 it will be seen that normally: the types on 'those two leversoccupy positions a v step llower down thany types of the other levers.

This provides for presenting the zero types.

of these two levers at the printing line by 'movement of the levers approxi-mately twice .tlie rdistancel that other levers mhve in presenting vero types at-the printing line. It may be desirablev to preventv depression of the 2 key in the tens of pounds row and the 9 key in the units vof pounds row at the strips 214. The particular 'bell cranks assosame time, it being 'preferable to'set up such' an amount. as 1 quarter and 1 pound' so that the printed record would show a result corresponding to that' registered on the wheels.

Therefore special interlocking devices are provided for the purpose as follows: In Figs-i519 and 20.a.l`ock strip S is shown extending between the two ceys in question and arran Y ed to slide lengthwise in suitable guides. he keys vas, usual act. upon bell cranks 217 which engage the familiar detent ciated with they above mentionedkeys are Y lo specially provided .with laterally projecting -pinsor studs 217"A and 21.7b respectively to operate upon the lock strip- S. r Thelatter is formed at opposite ends with depending f portions having cam. edges s a one or the l other offivhich normally stand ready to be engaged by av bell crank stud upon depression o'f the 'associated' key.' In Fig. 19

'291a cannot be depressed.

the stud :217a is'shown above the cam edge s.

.the stud Q17 against the cam edge s, cannot take place because of engagement of the other stud i217b with the cam edge a. It will be obvious that it the 2 tens key Q91b has been depressed, then the 9 units key Of course the above'interlocking devices can be applied if desired to include the unitsI 8 key as well as the 9. Furthermore, aside from the desirability of preventing depression of the Q-key in the tens of pounds row and the 9-key in the units of pounds row at the same time, for reasons already stated, itis further to be observed that the interlocking devices are useful, if not commercially essential, for the purpose of preventing manipulation of keys and operationlof the machine, otherwise -A possible. which would notcause all transfer or carrying actions to ensue that arerequisite to full registration of accumulated items.

What is claimed is:

1. In a machine of the class described the combination with accumulating wheels andv means Stor individually and differentially actuating the' same; of carrying mechanism associated witheach of two adjacent wheels vto advance the same, the wheel of higher order adapted to carry to the wheel of lower order. n

2. In a machine of the class described the combination with accumulating wheels and means for individually and diierentially actuating the same; of carrying mechanism associated with each of two adjacent wheels to advance the same each wheel adapted -to carry to the other. I

3. In a machine of the class described the combination with accumulating wheels and means for individually and differentially actuating the same; of carrying mechanism associated witheach of two adjacent wheels to advance the saine, the wheel of higher order adapted to carry to the wheel of lower order a double increment of movement.

4. In a machine of the class described the combination with accumulating wheels and i ment and that other adapted tocarry to the lirstsingle increments of movement.A

5. In amacliineof the class described the' combination with accumulating wheels and means for individually and dill'erentially actuating` the same; ot' carrying mechanism associa-ted with each of'two adjacent wheels to advance the same, each wheel adapted to carry to the other a double increment ot' movement. 1

6. In a machine of the class described the combination with accumulatingr Wheels and means 'for individually land diiterentially actuating the same; ot' carrying mechanism associated with each ot two adjacent wheels to advance the same, the wheel ont' higher'order adapted to carry to the wheel of lower order and the latter adapted to carry to the wheel ot' higher order single or double increments of movement.

7. In a machine of the class described the combination with accnnmlating wheels and means for individually and ditterentially actuating the same; ot carrying mechanism associated with each of two adjacent wheels to advance the same. the wheel ot higher order adapted to carry to the wheel of lower order a double increment otmovement' and the latter adapted to carry to the wheel ot him'her order single or double increments o't movement.

Si In a machine of the class described the combination with accumulating wheels and means for individually and differentially actuating the same: ot' duplex carrying mechanism controlled by one wheel and adapted to' cttect a double increment ol. movement of the adjacent wheel. and carrytn mechanism controlled h v the latter and adapted to ell'ect. advance movement. oi the tirst mentioned wheel.

t); ln a machine of the class described the combination with accumulatingwheels andA on, pawls to normallyY limit movement ot raclt's in the adding;- direction, and adding wheels with projections to displace Said pa wls, one ot the. wheels adapted to displace pawls associated with wheels of both higher and lower order.

ll. In a machine of the clase` described -thc combination of reciprocating` rack carriers, racks slot-pin-sprinfr mounted thereon. pawls to normally' limit movement of racks in the adding direction. and adding: wheels with projections to displace said pawls, one of the wheels adapted to displace pawls associated with wheels of h'oth higher and lower order and there heine' two pawls for the rack associated with such wheel both adapted to be displaced by the lower order wheel and 4one Such pawl controlled hy the other to limit movement ot' the rack resultant from displacement ot' thc second pawl and the latter when displaced from such limiting position permitting' an additonal increment ot movement of the rack.

1L.l ln a machine ot the class described the combination ot reciprocating rack carriers, racks slot-pin-spring mounted thereon, pawls to normalljv limit movement of racks inthe :nlding direction`r adding wheels with projections to displace said pawls, and

means 'tor displacing' a lower order pawl by a higher order wheel dependent upon extent ot advance of the vlower order wheel.

i3. ln a machine of the class de.. bed the conibination of reciprocating rack carriers. racks slot-pinspring mounted thereon. pawls to normally limit' movement oi. racks in thel adding direction. adding-wheels with projections to displace said pawlsl and means for displacing a lower order pawlv by a higher order wheel dependent. upon extent ot advance of the latter wheel.

14. l'n a machine ot the class described the combination ot reciprocating rack carriers. racks slot-pin-spring mounted thereon. pawls to normally limit movement of racks in thcaddingr direction, adding wheels with projections to displace said 'paix/ls, means tor displacing' a lower order paivl by a higher order wheel dependent upon extent ot advance ot the lower order wheel. and means tot' displacingr said lower order pawl dependent upon extent' ot advance ot thc higher order wheel.

l5. ln a ma thine ot the class dcscrihcd thc comluination ot reciprocating rack carriers. racks slol-pin-lsprinf; mounted thereon. pawls to normally limit movement ot' racks in the addingT direction. adding: wheels with projections to displace said pawls. and means for displacingY a lower order pawl h v a higher order wheel. the slot in the connection hetwecn the lower order rack and its carrier being' elongated to permit a douhlc increment ot advance ot thc wheel.

lo. ln a machine ot the class described the combination ot reciproca-ting rack carriers. racks slot-pin-spring mounted thereon. pawls to normally limit movement ot racks in the adding direction. and adding wheels with projections to displace said pawls, one ot' the wheels adapted to displace pawls associated with wheels of both higher and lower order and there beingr two pawls for the rack associated withlsuch wheel both adapted to lire displaced by thc lower order wheel and one such pawl controlled h v the other to limit movement of the rack resultant from displacement.- of the seco-nd pawl and the latter when displaced trom such limiting position permit-ting an f 1,053,687 y er additional increment of movement of the Tack, the slotin the connection, between said y rack and its carrier being elongated.

17. In a machine of the class described the combination of reciprocating rack can.

riers, racks slot-pin-spring mounted thereon, pawls'to normally limit movement of.

racks in the addingA direction, and adding wheels with projections to displace' said pawls, one of the wheels adapted to displace pawls associatedA with wheels of both higher and lower order and there being two pawls rfor the rack associated with such wheel both adapted to be displaced by the lower order wheel and one such pawl controlled by the other to limit movement of the rack resultant from displacement of the second pawl and the latter when displaced from such limiting position permitting an additional increment of movement of the rack, the slot in uthe connection between said rack and its carrier being elongated, and the second pawl shouldered and spring-connected to 'the lirst.

h 'u u n u lcombination of reciprocating rack carriers` 18. In a machine of the class described the racks slot pin spring mounted thereon, pawls to normally limit movement of racks in the adding direction, and adding wheels with projections to displace said pawls, one of the wheels adapted to displace pawls associated with wheels of both higher and lower order and there being two pawls for the rack associated with such wheel both adapted to be displaced by the lower order wheel and one such pawl cont-rolled by the other to limit movement of the-rack resultant from displacement of the second pawl and the latter when displaced from such limiting position permittin an additional increment of movement of t e rack, the slot in the connection between said rack and its 'carrier being elongated, and the second pawl shouldered and spring-connected to theu first and. having a pivoted arm coupled to it and constructed to be acted upon by a project-ion on the llower order wheel when the firstv pawl has beendisplaced.

19.' In a machine of the class described the combination of' reciprocating rack carriers,

racks slot-pin-spring mounted thereon, pawls to normally limit movement of racks in the addingdirection,'adding wheels with projectionsto displace said pawls, and an auX- iliaijy/displacing member for the pawl of a lower order* wheel with provisions for' its operation by. the wheel of next higher order.

20. In a machine of the class described f thecombination of reciprocating rack carracks in the adding direction, adding wheels `racksu slot-pin-spiing with projections to displace said pawls, andl an 'auxiliary displacing member for the pawl of a lower order wheel with provisions for its operation by the wheel of next higher order under control ofthe said lower order wheel. K

2.1. In a machine of the class described the combina-tion of reciprocating rackicarriers, mounted thereon, pawlsto normally limit movement of racks in the adding direction, adding wheels with project-ions to displace said pawls, andan auxiliary displacing member for the pawl ofv a lower order wheel with provisions for its operation bythe wheel of next higher order under control of the said lower order wheel when the higher order wheel advances a predetermined extent and also with provisions for operation of said displacing member by said higher order wheel when advanced a step farther and independent oi' said control by the lower order wheel.

22. In a machine o'the class described the combination'ot reciprocating rack carriers, racks slot-pin-spring mounted thereon, pawls to normally limit movement of racks in the adding direction, adding wheels with projections to displacesaid pawls, an oscillatory finger constituting an'auXilia-ry displacing `member for the pawl of a lower order wheel, a cross head haviugswivel connection with said arm, and independently movable arms engageable with said crosshead on opposite sides of its swivel-point 'and operated upon by projections of said lower order wheel and the next higher order' wheel respectively to rock the finger through the medium oit/the said cross-head.

, 23. In a machine of the class described the combination of reciprocating rack carriers, racks slotc-pin-spring mounted ,thereon, pawls topnormally limit movement of 'racks in the adding direction, adding wheels with projections to displace said pawls, an

oscillatory finger constituting an auxiliary displacing member tor the pawl ot' a lower.

order wheel, a cross head having swivel con' :FREDERICK WHEAT. [n s] Witnesses :V

HERBERT D; JAMESON, R. lViLLiAMs. 

